Dry air at 20ºC, 101 kPa, passes through a 2-cm diameter tube at 5 m/s. If the tube is also at 20ºC and has acetone on its inside surface area, estimate the evaporation rate of acetone into air per unit area. Assume the density of saturated vapor acetone is 2.37 g/m^3.
What will be an ideal response?
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A block is given a very brief push up a 20.0° frictionless incline to give it an initial speed of 12.0 m/s
(a) How far along the surface of the plane does the block slide before coming to rest? (b) How much time does it take to return to its starting position? What will be an ideal response?
How much power is theoretically available from a mass flow of 1 000 kg/s of water when it falls a vertical distance of 100 meters?
a. 980 kW b. 98 kW c. 4 900 W d. 980 W e. 9 600 W
To subtract a vector from another vector:
a. add the two vectors and make the result negative. b. draw an arrow from the tail of the first vector to the head of the second. c. draw an arrow from the head of the first vector to the tail of the second. d. turn the arrow you are subtracting around, and then add. e. put one on top of the other, put a minus sign by the lower one, and then subtract as if they were numbers.
According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the number of photons. b. the energy of each photon. c. the speed of the photons. d. the frequency of the photons.